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<a NAME="E1:172_1_1"/>
 <a href="relat_1.html#K2">rng</a> <span class="p1">(<span class="default"><a href="pboole.html#K1" target="_self">[0]</a> <font color="Maroon">I</font></span>)</span> <a href="tarski.html#R1">c=</a> <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><a href="xboole_0.html#K1">{}</a> </span><a href="tarski.html#K1">}</a></span>
 
<b>by </b><i><a class="ref" href="funcop_1.html#T19">FUNCOP_1:19</a></i>;<br/>
<b>hence </b><a NAME="E2:172_1_1"/>
 <a href="pboole.html#K1" target="_self">[0]</a> <font color="Maroon">I</font> is <a href="relat_1.html#V3">empty-yielding</a>
 <b>by </b><i><a class="ref" href="relat_1.html#D15">RELAT_1:def 15</a></i>;<br/>


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